from tkinter import *

X = int(input('Введите X:\n\t'))
Y = int(input('Введите Y:\n\t'))
N = int(input('Введите N:\n\t'))

coords = [0, 0, 4, 0, 4, 4, 8, 4, 8, 0, 12, 0, 12, 8, 0, 8]

root = Tk()
root.title("ИТ марафон")
root.geometry("500x500")

canvas = Canvas(bg="green", width=500, height=500)
canvas.pack(anchor=CENTER, expand=1)
if N == 0 and X>=0 and X<=500 and Y>=0 and Y<=500:
    pass
else:
    if N > 0 and 0*N+X>=0 and 0*N+Y>=0 and 20*N+X<=500 and 20*N+Y<=500:
        pass
    else:
        if N < 0 and 20*N+X>=0 and 20*N+Y>=0 and 0*N+X<=500 and 0*N+Y<=500:
            pass
        else:
            print('Размер фигуры превышает максимальный размер поля')
            exit()
canvas.create_polygon(coords[0]*N+X, coords[1]*N+Y,
    coords[2]*N+X, coords[3]*N+Y,
    coords[4]*N+X, coords[5]*N+Y,
    coords[6]*N+X, coords[7]*N+Y,
    coords[8]*N+X, coords[9]*N+Y,
    coords[10]*N+X, coords[11]*N+Y,
    coords[12]*N+X, coords[13]*N+Y,
    coords[14]*N+X, coords[15]*N+Y)
root.mainloop()
